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Note 8 - Investments, Including Investments Accounted for Using the Equity Method (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 16, 2020
Oct. 26, 2020
Sep. 24, 2020
May 31, 2018
Dec. 31, 2017
May 31, 2019
Jan. 31, 2018
May 01, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 01, 2020
Dec. 31, 2018
Gain (Loss) on Sale of Investments, Total                     $ 5,701,909 $ 572,181    
Proceeds from Redemption of Preferred Units                     12,000,000 0    
Payments to Acquire Equity Method Investments                     $ 5,715,625 $ 264,834    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                 $ 9.95   $ 9.95 $ 9.95   $ 9.95
Proceeds from Sale of Equity Method Investments                     $ 309,375 $ (0)    
Equity Method Investment, Gain (Loss) on Remeasurement                     5,074,587 $ 0    
Dream Finders Holdings, LLC [Member] | Term Loan Receivable [Member]                            
Notes Receivable, Related Parties                 $ 20,000,000   $ 20,000,000      
Note Receivable, Interest Rate                 14.00%   14.00%      
Dream Finders Holdings, LLC [Member] | Term Loan Receivable [Member] | Forecast [Member]                            
Note Receivable, Monthly Payments               $ 5,000,000            
Common Class B [Member]                            
Common Stock, Par or Stated Value Per Share (in dollars per share)                 $ 1   $ 1 $ 1    
BOC Yellowstone LLC [Member] | BOC Yellowstone II LLC [Member]                            
Number of Investee's Shares Transferred to Related Party for No Consideration (in shares) 206,250                          
Yellowstone Acquisition Company [Member]                            
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.0001                      
Proceeds from Issuance Initial Public Offering   $ 125,000,000                        
Yellowstone Acquisition Company [Member] | Private Placement Warrants [Member]                            
Number of Warrants Called by Each Unit (in shares)   1.5                        
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   1             1   1      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 11.50             $ 11.50   $ 11.50   $ 11.50  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   7,500,000                     219,779  
Price of Warrant (in dollars per share)   $ 1.00             $ 1.00   $ 1.00   $ 1.00  
Proceeds from Issuance of Warrants   $ 7,500,000                        
Yellowstone Acquisition Company [Member] | IPO [Member]                            
Number of Units Issued (in shares)   12,500,000                        
Number of Securities Called by Each Unit (in shares)   1                        
Sale of Unit, Price Per Unit (in dollars per share)   $ 10.00                        
Yellowstone Acquisition Company [Member] | Common Class B [Member]                            
Shares, Outstanding, Ending Balance (in shares)                 3,399,724   3,399,724      
Yellowstone Acquisition Company [Member] | Common Class B [Member] | IPO [Member]                            
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.0001                        
Unconsolidated Affiliates [Member]                            
Equity Method Investments                 $ 6,687,707   $ 6,687,707      
Unconsolidated Affiliates [Member] | Minimum [Member]                            
Equity Method Investment, Ownership Percentage                 5.60%   5.60%      
Unconsolidated Affiliates [Member] | Maximum [Member]                            
Equity Method Investment, Ownership Percentage                 30.00%   30.00%      
The 24th Street Fund I, LLC [Member]                            
Payments to Acquire Equity Method Investments                     $ 6,000,000      
Yellowstone Acquisition Company [Member] | Unrealized Gain (Loss) on Securities [Member]                            
Equity Method Investment, Gain (Loss) on Remeasurement                     5,074,587      
Yellowstone Acquisition Company [Member] | BOC Yellowstone LLC [Member]                            
Payments to Acquire Equity Method Investments     $ 25,000                      
Number of Affiliate's Shares Acquired (in shares)     5,750,000                      
Number of Affiliate's Shares Surrendered for No Consideration (in shares)                 2,350,276          
BOC Yellowstone II LLC [Member] | BOC Yellowstone LLC [Member]                            
Proceeds from Sale of Equity Method Investments $ 309,375                          
Breezeway Homes Inc. [Member]                            
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share)             $ 2,665              
Lead Investor in Yellowstone’s IPO [Member] | BOC Yellowstone LLC [Member]                            
Number of Investee's Shares Agreed to Transfer Upon Business Combination (in shares) 206,250                          
Preferred Stock [Member] | Breezeway Homes Inc. [Member]                            
Debt Conversion, Converted Instrument, Shares Issued (in shares)             31,227              
US Treasury Notes Securities [Member]                            
Gain (Loss) on Sale of Investments, Total                     13,159      
Voting Common Stock of Privately Held Company CB&T Holding Corporation [Member]                            
Payments to Acquire Long-term Investments       $ 19,058,485                    
Cost Method Investment, Ownership Percentage       14.99%                    
Non-voting Common Units of LLC [Member]                            
Payments to Acquire Long-term Investments         $ 10,000,000                  
Cost Method Investment, Ownership Percentage         5.60%                  
Non-voting Preferred Units of DFH LLC [Member]                            
Payments to Acquire Long-term Investments           $ 12,000,000                
Mandatory Preferred Return, Percent           14.00%                
Percent of Preferred Units Convertible to Non-voting Common Units           25.00%                
Proceeds from Redemption of Preferred Units                   $ 12,000,000        
Equity Investments [Member]                            
Other than Temporary Impairment Losses, Investments, Total                     $ 0 $ 0